Premise: Educator Henry Louis Gates Jr. has hosted several PBS series that examine U.S. history. In ``Finding Your Roots,'' the Harvard professor continues his quest to ``get into the DNA of American culture.'' In each episode, celebrities view ancestral histories, sometimes learn of connections to famous/infamous people, discover secrets and share the emotional experience with viewers. Analyzing genetic code, DNA diagnosticians trace bloodlines and occasionally debunk long-held beliefs. Among those featured in the second season are Stephen King, Ben Affleck, Angela Bassett and Sally Field.